SU362463A1 - EXPONENTIAL PULSE GENERATOR - Google Patents

Description

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The invention relates to a measuring technique and can be used in devices with a linear reading of measured logarithmic quantities.

Generators of exponential pulses are known, the principle of operation of which is based on controlled charge and discharge of a / C-value.

However, the known generators have low temperature and temporal stability.

In order to increase the stability of the parameters of the generated pulses, the proposed generator is additionally connected with correction resistors with serially connected keys and a reversible pulse counter, whose output circuits are connected to the inputs of the keys, and the input circuit of the reversible counter is connected to the output of the comparator and the source of gating pulses, and resistors with series-connected keys are connected in parallel to the time setting RC-n & uK.

In the drawing, a functional schelg of the proposed exponential impulse generator is given.

The proposed generator contains a source / reference voltage, a charging switch 2, a time setting, a / C circuit 3, a source of 4 gating pulses, a divider 5 of the reference voltage, a comparator 6, a reversible counter of impulses 7, correction resistors 8, keys 9, decoders 10 and 11 minimum and maximum values and trigger 12 control.

The source of on-voltage 1, through the charging switch 2, charges the capacitor with the time of the master 1 / C-circuit 3 from the source of the strobe pulse 4, the latter locks the charging switch 2, and the time of the driving ./C-circuit 3 is discharged. When the voltage taken from the tap of the divider 5 of the reference voltage and the output voltage of the generator is equal, the signal from the output of the comparator 6 coincides with the end of the gate pulse when there is only one unit in the reversing pulse counter 7 in the senior discharge. If the gate pulse expires earlier (the time constant of the exponent is greater than the specified one), then the comparator 6 remains in the initial state, in which it is maintained by the open input of the counting counter of the pulse counter 7, and the counter of the gate signal increases by one. In this case, the total conductivity of the correction resistors 8, which are connected by the keys 9 on the generator output, decreases depending on the state of the reversible pulse counter 7. If the moment of equality is equal to 1) the number of inputs, parator 6 is ahead of the end of the gating pulse (the time constant is less than the specified ), then the comparator 6 is triggered by opening the reverse counting input of the reversible counter of emuls 7, the trailing edge of the strobe impulse 5 reduces the contents of the counter, while the total conductivity and Also decreases, increasing the time constant of the exponent. This achieves an increase in the stability of the generated pulses in a wide range of 10 changes in external conditions. To signal the extreme values of the account, the decoders 10 and // the minimum and maximum values are intended, setting the trigger 12 of the control to the excited 15 state. Subject of the Invention An exponential impulse generator containing a source of reference voltage, connected via a resistor to a divider of a reference voltage, with one of the inputs of a comparator n charging a key, and the other input of a charging key of a compiler, connected to the output of a gate source, charging A diy key and a master / C-circuit time, characterized in that, in order to increase the stability of the parameters of the generated pulses, corrective resistors are connected to the generator in series with unity keys and reversible pulse counter, whose output circuits are connected to the key input, and the input Exalt reversible pulse counter connected to the output komnaratora source and gate drivers, wherein the corrective resistors serially connected nodklyuchen keys) narallelno 1 to RC-time specifying tssii.

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